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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd14439591b2a048810656cc7448b8ab73d6a6e64ccc1f10212174cf251f8e1' 
  AND token = '32i2GWR2FGbX1V7Upd8+ugxmAm3YQaaOsZp4dNLwvvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}